Wikipedia says that organosilicon compounds are organic compounds with carbon-silicon bonds.

Does the class of organosilicon compounds include compounds in which the carbon and silicon are only indirectly bonded, for example the (hypothetical) molecule 1,3,5-trihydroxy-4,6-dioxa-2-lambda3-oxa-3,5-disilacyclohex-1-ene(3+), in which the carbon and silicon atoms are not formally directly bonded but are part of the same aromatic (six π-electrons) ring, sharing the same aromatic bonding orbitals?

Here's what the molecule looks like (direct uploadd won't work for some reason...)

  • $\begingroup$ Is there the possibility to include a picture of this hypothetical compound. Not all of us might be familiar with this type of naming scheme. (Yes, I really have not a single clue, what this compound might look like.) $\endgroup$ – Martin - マーチン Nov 28 '19 at 14:36

Organosilicon compounds fall under the broader category of Organometallic compounds. It is a requirement that in organometallic compounds, atleast one $\ce{C-M}$ bond should exist. Since Si is only bonded to oxygen atoms in your compound, the given compound is not an organosilicon compound.

The following is also mentioned in the wikipedia page for Organosilicon compounds, under the image:

A carbon–silicon bond present in all organosilicon compounds

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